refactor(worker): share the platform browser opener; add the graph ar… #248

Job	Run time
pins are exact (CONST-PI-VERSION-PINNED)	5s
the job image holds its contract	3m 6s
pinned assumptions still hold (offline, no API key)	1m 29s
the admin extension survives latest pi (canary)	28s
host-pi mirrors survive latest pi (canary)	16s
no automatic merge (CONST-MERGE-NEVER-AUTOMATIC)	6s
	5m 30s

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